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        <p>Library Version 11.2.5.3</p>
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            <h2 class="title" style="clear: both"><a id="db_env_set_func_exists"></a>db_env_set_func_exists</h2>
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      <pre class="programlisting">#include &lt;db.h&gt;

int
db_env_set_func_exists(int (*func_exists)(const char *path, 
                       int *isdirp)); </pre>
      <p>
         The Berkeley DB library requires the ability to determine whether a
         file exists and whether it is a file of type directory.
    </p>
      <p>
         The <code class="function">db_env_set_func_exists()</code> function configures all operations performed
         by a process and all of its threads of control, not operations
         confined to a single database environment.
    </p>
      <p>
         Although the <code class="function">db_env_set_func_exists()</code> function may be called at any time
         during the life of the application, it should normally be called
         before making calls to the <a class="xref" href="envcreate.html" title="db_env_create">db_env_create</a> or
         <a class="xref" href="dbcreate.html" title="db_create">db_create</a> methods.
    </p>
      <p>
         The <code class="function">db_env_set_func_exists()</code> <span>
                  function returns a non-zero error value on failure and 0 on success.
            </span>
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              <h3 class="title"><a id="idp55585080"></a>Parameters</h3>
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                <h4 class="title"><a id="idp55585272"></a>func_exists</h4>
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          <p>
                          The <span class="bold"><strong>func_exists</strong></span> parameter is the
                          function which returns if a file exists and if it is a file of type
                          directory.
                     </p>
          <p>
                          The <span class="bold"><strong>path</strong></span> parameter to this function
                          is the pathname of the file to be checked.
                     </p>
          <p>
                          If the <span class="bold"><strong>isdirp</strong></span> parameter is non-NULL,
                          it must be set to non-0 if <span class="bold"><strong>path</strong></span> is a
                          directory, and 0 if <span class="bold"><strong>path</strong></span> is not a
                          directory.
                     </p>
          <p>
                          The <span class="bold"><strong>func_exists</strong></span> function must return
                          the value of <span class="bold"><strong>errno</strong></span> on failure and 0
                          on success.
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          <a href="../../programmer_reference/program_runtime.html" class="olink">Run-time configuration</a>

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